崂山林场不同密度赤松林的生长差异研究

摘要

This paper studied the growth variability of Pinus densiflora plantations with different densities in Laoshan Forest Farm,as well as the correlation between DBH and crown width. The results showed that under different densities,the diameter distribution of P. densiflora plantations increased first and then decreased. With the increase of stand density, DBH growth decreased significantly and the diameter class ratio decreased. The average tree height,clear length,and crown diameter of P. densiflora plantation were all on the rise. There was no significant difference in tree height growth between P. densiflora with different densities,and the clear length was significantly different,and the difference in DBH was very significant.The crown diameter of P.densiflora plantation was decreased with the increasing of stand density,but the crown ellipsoid volume was the opposite. Through analysis,the quadratic polynomial equation was obtained as the optimal model between DBH and crown width of P. densiflora plantation,and the relationship equation was obtained, which provided the basis for forestry production.%研究了崂山林场不同密度下赤松人工林的生长差异性以及胸径与冠幅的相关性.不同密度下赤松人工林径阶分布呈现先增后减的趋势,随着林分密度的增大,胸径生长量显著减少,径阶比例减少;赤松人工林的平均树高、枝下高以及冠幅均呈上升趋势.在不同密度的赤松林分之间,树高生长差异不显著,枝下高差异显著,胸径差异极显著.赤松人工林的冠幅随着林分密度的增加而逐渐减少,但冠幅的椭球体积与之相反;通过分析得到二次多项式方程作为赤松人工林胸径与冠幅的最优关系模型,并求出方程关系式,为林业生产提供依据.